<template>
  <div class="com-container">
    <div class="com-chart" ref="rank_ref"></div>
  </div>
</template>

<script>
import { mapState } from 'vuex'

export default {
  name: "Rank",
  data() {
    return {
      chartInstance: null,
      allData: [],
      //区域缩放起点
      startValue: 0,
      //   区域缩放终点
      endValue: 9,
      timerId: null,
    };
  },
  mounted() {
    this.initChart();
    this.getData();
    window.addEventListener("resize", this.screenAdapter);
    this.screenAdapter();
  },
  destroyed() {
    window.removeEventListener("resize", this.screenAdapter);
    clearInterval(this.timerId);
  },
  methods: {
    initChart() {
      this.chartInstance = this.$echarts.init(this.$refs.rank_ref, this.theme);
      const initOptions = {
        title: {
          text: "┃ 地区销量排行",
          left:20,
          top: 20
        },
        tooltip: {
          show: true,
        },
        grid: {
          top: "40%",
          left: "5%",
          right: "5%",
          bottom: "10%",
          containLabel: true,
        },
        xAxis: {
          type: "category",
        },
        yAxis: {
          type: "value",
        },
        series: [{ type: "bar" }],
      };
      this.chartInstance.setOption(initOptions);
      this.chartInstance.on("mouseover",()=>{
          clearInterval(this.timerId)
      })
       this.chartInstance.on("mouseout",()=>{
          this.startInterval()
      })
    },
    async getData() {
      const { data: ret } = await this.$axios.get("rank");
      this.allData = ret;
      this.allData.sort((a, b) => {
        return b.value - a.value;
      });
      this.updateChart();
      this.startInterval();
    },
    updateChart() {
      const colorArr = [
        ["#0BA82C", "#4FF778"],
        ["#2E72BF", "#23E5E5"],
        ["#5052EE", "#AB6EE5"],
      ];
      // 处理数据
      //所有省份的数据
      const proviceArr = this.allData.map((item) => {
        return item.name;
      });
      //所有省份对应的销售额
      const valueArr = this.allData.map((item) => {
        return item.value;
      });
      const dataOption = {
        xAxis: {
          data: proviceArr,
        },
        dataZoom: {
          show: false,
          startValue: this.startValue,
          endValue: this.endValue,
        },
        series: [
          {
            data: valueArr,
            itemStyle: {
              color: (arg) => {
                let targetColor = null;
                if (arg.value > 300) {
                  targetColor = colorArr[0];
                } else if (arg.value > 200) {
                  targetColor = colorArr[1];
                } else {
                  targetColor = colorArr[2];
                }
                return new this.$echarts.graphic.LinearGradient(0, 0, 0, 1, [
                  { offset: 0, color: targetColor[0] },
                  {
                    offset: 1,
                    color: targetColor[1],
                  },
                ]);
              },
            },
          },
        ],
      };
      this.chartInstance.setOption(dataOption);
    },
    screenAdapter() {
       const titleFontSize = this.$refs.rank_ref.offsetWidth / 100 * 3.6;
      const adapterOption = {
          title:{
              textStyle:{
                  fontSize: titleFontSize
              },
              series:[
                  {
                  barWidth: titleFontSize,
                  itemStyle:{
                      barBorderRadius:[titleFontSize/2, titleFontSize/2,0,0]
                  }
              }
              ]
          }
      }
      this.chartInstance.setOption(adapterOption);
      this.chartInstance.resize();
    },
    startInterval() {
      if (this.timerId) {
        clearInterval(this.timer);
      }
      this.timerId = setInterval(() => {
        this.startValue++;
        this.endValue++;
        if (this.endValue > this.allData.length - 1) {
          this.startValue = 0;
          this.endValue = 9;
        }
        this.updateChart();
      }, 3000);
    },
  },
   computed: {
    ...mapState(['theme'])
  },
  watch: {
    theme () {
      console.log('主题切换了')
      this.chartInstance.dispose() // 销毁当前的图表
      this.initChart() // 重新以最新的主题名称初始化图表对象
      this.screenAdapter() // 完成屏幕的适配
      this.updateChart() // 更新图表的展示
    }
  }
};
</script>

<style>
</style>